Olympus stylus 800 ユーザーズマニュアル

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If the correct focus cannot be obtained
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Under certain types of conditions, the auto focus may not work properly.
In these cases, focus (focus lock) on an object with high contrast at the same 
distance as the intended subject, recompose your shot and then take the picture. If 
the subject has no vertical lines, hold the camera vertically and focus the camera 
using the focus lock function by pressing the shutter button halfway, then return the 
camera to the horizontal position while keeping the button pressed halfway and take 
the picture.
Subjects that are difficult to focus on
The green lamp 
blinks.
The subject cannot 
be brought into 
focus.
Subject with 
low contrast
Subject with an 
extremely 
bright area in 
the center of 
the frame
Subject without 
vertical lines
Subjects at 
different 
distances
Fast-moving 
subject
The subject is 
not in the center 
of the frame
The green lamp 
lights, but the 
subject cannot be 
brought into focus.